Hi @Fjosen -
This may be possible, but you would be connecting the game controller and vehicle to your computer, and using the Meta Quest 3 to observe the desktop running QGround Control or Cockpit. It seems this is supported?
Yes, you can use the Meta Quest 3 as a topside pad with cockpit mode and connect a PS4 or Xbox controller to it. Just pair the controller with your headset via Bluetooth settings. This setup should help you avoid glare form daylight on your tablet screen.